Claude 4.1 Opus Thinking (1K)
Flagship Claude model for deep reasoning, coding, and long-horizon agents
Model facts
- Context window
- 2K tokens
- Maximum output
- 32K tokens
- Cheapest paid input
- $15 per 1M tokens
- Cheapest paid output
- $75 per 1M tokens
- Open weights
- no
- Providers
- 1
Capabilities and modalities
reasoning, tool calling, structured output, attachments, temperature control, text, image, pdf.
Observed price history
- 2026-08-24: $15 input / $75 output per 1M tokens
API providers
- NanoGPT — model id claude-opus-4-1-thinking:1024; $15 input / $75 output per 1M tokens; provider documentation